Without being brahma-bhūta that, "I am spirit soul," Kṛṣṇa consciousness does not become very perfect. If we are in the bodily concept of life, then it is rather difficult. It will take time. Because unless you come to the platform to understand that you are not this body, you are spirit soul, the actual devotional service does not begin.
But to the neophyte student, the chance is given to develop this devotional service: śravaṇaṁ kīrtanaṁ smaraṇam arcanaṁ vandanaṁ dāsyam (SB 7.5.23). The method is by constantly being engaged in devotional service, one becomes realized soul. God helps him, Kṛṣṇa helps him. Then he becomes a perfect, liberated soul.
Liberated soul means hitvā anyathā-rūpam. Now we are working under the designation of this body. Everyone is working under this designation of this body. When we become above the designation of the body, that is our real, constitutional position.
So first of all, to realize that, "I am not this body," and the next stage is that, "I am spirit soul, part and parcel of Kṛṣṇa. Therefore as part and parcel is meant for giving service to the whole, therefore my constitutional position is to serve Kṛṣṇa." That is perfection of life.